Highly Efficient Inverted Light-Emitting Diodes Based on Vertically Aligned CdSe/CdS Nanorod Layers Fabricated by Electrophoretic Deposition

Zhang, Yongliang1,2; Pham, Xuan-Manh2,3; Keating, Thomas1,2; Jia, Na2,3; Mullen, Anthony1,2; Laishram, Devika1,2; Gao, Mei-Yan2,3; Corbett, Brian4; Liu, Pai5,7; Sun, Xiao Wei5,6; Soulimane, Tewfik2,3; Silien, Christophe1; Ryan, Kevin M.2,3; Ma, Zhenhui8; Liu, Ning1,2

2024-02-15

10.1021/acsami.3c15542

ACS APPLIED MATERIALS & INTERFACES   影响因子和分区

1944-8244

1944-8252

Inverted colloidal-nanocrystal-based LEDs (NC-LEDs) are highly interesting and invaluable for large-scale display technology and flexible electronics. Semiconductor nanorods (NRs), in addition to the tunable wavelengths of the emitted light (achieved, for example, by the variation of the NR diameter or the diameter of core in a core-shell configuration), also exhibit linearly polarized emission, a larger Stokes shift, faster radiative decay, and slower bleaching kinetics than quantum dots (QDs). Despite these advantages, it is difficult to achieve void-free active NR layers using simple spin-coating techniques. Herein, we employ electrophoretic deposition (EPD) to make closely packed, vertically aligned CdSe/CdS core/shell nanorods (NRs) as the emissive layer. Following an inverted architecture, the device fabricated yields an external quantum efficiency (EQE) of 6.3% and a maximum luminance of 4320 cd/m(2) at 11 V. This good performance can be attributed to the vertically aligned NR layer, enhancing the charge transport by reducing the resistance of carrier passage, which is supported by our finite element simulations. To the best of our knowledge, this is the first time vertically aligned NR layers made by EPD have been reported for the fabrication of NC-LEDs and the device performance is one of the best for inverted red NR-LEDs. The findings presented in this work bring forth a simple and effective technique for making vertically aligned NRs, and the mechanism behind the NR-LED device with enhanced performance using these NRs is illustrated. This technique may prove useful to the development of a vast class of nanocrystal-based optoelectronics, including solar cells and laser devices.

nanocrystal-based light-emitting diodes inverted architecture electrophoretic deposition vertically aligned nanorods finite element simulation

SCI ; EI

英语

通讯

Shenzhen Key Laboratory for Deep Subwavelength Scale Photonics["SFI 17/CDA/4733","SFI 12/RC/2276_P2","SFI 18/CRT/6049"] ; Science Foundation Ireland (SFI)[IRCLA/2017/285] ; Irish Research Council (IRC)[(ZDSYS20220527171201003)] ; Irish Research Council (IRC)[IRCLA/2017/285]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001164647100001

AMER CHEMICAL SOC

Web of Science

1.Univ Limerick, Dept Phys, Castletroy V94 T9PX, Ireland
2.Univ Limerick, Bernal Inst, Castletroy V94 T9PX, Ireland
3.Univ Limerick, Dept Chem Sci, Limerick V94 T9PX, Ireland
4.Univ Coll Cork, Tyndall Natl Inst, Cork T12R5CP, Ireland
5.Southern Univ Sci & Technol, Inst Nanosci & Applicat, Shenzhen 518055, Guangdong, Peoples R China
6.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Guangdong, Peoples R China
7.Southern Univ Sci & Technol, Shenzhen Key Lab Deep Subwavelength Scale Photon, Shenzhen 518055, Guangdong, Peoples R China
8.Beijing Technol & Business Univ, Dept Phys, Beijing 100048, Peoples R China

Zhang, Yongliang,Pham, Xuan-Manh,Keating, Thomas,et al. Highly Efficient Inverted Light-Emitting Diodes Based on Vertically Aligned CdSe/CdS Nanorod Layers Fabricated by Electrophoretic Deposition[J]. ACS APPLIED MATERIALS & INTERFACES,2024,16(8).

Zhang, Yongliang.,Pham, Xuan-Manh.,Keating, Thomas.,Jia, Na.,Mullen, Anthony.,...&Liu, Ning.(2024).Highly Efficient Inverted Light-Emitting Diodes Based on Vertically Aligned CdSe/CdS Nanorod Layers Fabricated by Electrophoretic Deposition.ACS APPLIED MATERIALS & INTERFACES,16(8).

Zhang, Yongliang,et al."Highly Efficient Inverted Light-Emitting Diodes Based on Vertically Aligned CdSe/CdS Nanorod Layers Fabricated by Electrophoretic Deposition".ACS APPLIED MATERIALS & INTERFACES 16.8(2024).